The fire experiments of three test beams were accomplished. The temperature field, the deflection deformation and the cracking distribution of the steel-concrete composite girders exposed to fire were tested. And the residual strengths and the failure modes of these three test beams under static loads were measured. The calculation formula of the compressive zone depth of concrete after fire was deduced based on the strength expression of concrete after fire and the temperature distribution function.The results indicate that the vertical deflections of the three test beams under dead loads in fire increase as the time goes on. The simple supported T-beam and the box girder have no obvious crack at the top of concrete. But as for the continuous box girder, several cut through cracks are observed at the top of concrete in the hogging moment area and the widths of these cracks increase as the time goes on. The temperature at the top of the box girder rises slowly, resulting in better fire resistance compared with the T-girder. The proposed calculation method for the residual strength has high accuracy.